JP5448394B2 - Compressor safety valve - Google Patents

Description

  The present invention relates to a safety valve for a compressor that releases abnormal pressure to the outside when the refrigerant pressure in the compressor abnormally rises.

  A refrigerant compressor for an in-vehicle air conditioner is usually installed in an engine room and is driven by obtaining power from a vehicle engine. Therefore, the number of compressors depends on the operating condition of the vehicle engine. If the engine speed changes suddenly, the number of compressors changes drastically, and the refrigerant temperature and pressure in the compressor change drastically. There is. Especially under severe weather conditions, the pressure in the compressor may rise abnormally. For this reason, the refrigerant compressor for in-vehicle air conditioners is provided with a safety valve for releasing the abnormal pressure to the outside when the pressure in the compressor rises abnormally from the viewpoint of safety.

  The safety valve is provided so as to communicate with a discharge system path in the compressor, and is configured so that when the pressure in the discharge system path exceeds a set pressure, the valve opens and discharges a part of the refrigerant from the discharge hole to the outside. ing. However, since this safety valve is exposed to the harsh environment in the engine room, oil-mixed refrigerant is released from the safety valve, and when it comes into contact with a high-temperature body such as an engine, it becomes white smoke and the engine room There was a problem of soiling the equipment. In addition, foreign matter such as mud and sand may be clogged in the discharge hole and the valve may be closed, or the valve may be normally opened by biting the foreign matter.

  Therefore, a cap that covers the discharge hole is attached to the safety valve, and a guide port that discharges the refrigerant discharged from the discharge hole in a specific direction (see Patent Document 1), or a cover that is detachable from the safety valve. An elastic body is interposed between the cover and the valve body, and a gas discharge passage is formed by providing a groove having a start end facing the discharge hole and a terminal end reaching the outer edge in the elastic body, Furthermore, what provided the labyrinth in the terminal part of the groove | channel of an elastic body (refer patent document 2) etc. is proposed.

Japanese Patent No. 3266985 Japanese Patent No. 3038681

  Since the thing of patent document 1 can regulate the direction which discharge | releases a refrigerant | coolant, it can be said that it is effective as a countermeasure against white smoke generation at the time of refrigerant | coolant discharge | release. However, it is difficult to prevent foreign matter from entering the discharge hole. Therefore, it is necessary to solve problems such as valve blockage caused by foreign matter such as mud and sand and loss of valve function due to foreign matter biting. I couldn't.

  Moreover, since the thing of patent document 2 provides the groove | channel in the elastic body, forms a gas discharge flow path, and also provides the labyrinth in the exit, while being able to regulate the discharge direction of a refrigerant, On the other hand, it is also possible to expect the effect of preventing the entry of foreign substances such as sand. However, the labyrinth is an elastic thin film, and it has been difficult to expect a sufficient effect of preventing foreign substances such as sand from entering. And since it is necessary to provide the groove which regulates a refrigerant | coolant discharge | release direction in an elastic body, the thickness of an elastic body becomes thick. For this reason, the height direction dimension of the safety valve is increased, and there is a problem that it is difficult to secure a space for arranging the cap.

  The present invention has been made in view of such circumstances, and provides a highly reliable safety valve for a compressor that can reliably prevent foreign matter from entering a discharge hole and maintain the valve function for a long period of time. With the goal.

In order to solve the above problems, the compressor safety valve of the present invention employs the following means.
That is, the safety valve of the compressor according to the present invention has a discharge hole communicating with a discharge system path in the compressor at the head of the valve body, and when the pressure in the compressor rises abnormally, In a safety valve for a compressor that releases pressure to the outside, a cap having a locking portion integrally formed and detachably attached to the head of the valve body via the locking portion, and the cap An elastic body interposed between the valve body head and the valve body in a compressed state and in close contact with the valve body head, and the elastic body is interposed so as to cover the entire peripheral surface of the discharge hole. The cap is locked to the head of the valve body by the elastic repulsive force of the elastic body, and the discharge hole is closed via the elastic body and the cap.

  According to the present invention, a cap that is detachably attached to the head of the valve body, and an elastic body that is interposed between the cap and the head of the valve body in a compressed state and is in close contact with the head of the valve body The elastic body is interposed so as to cover the entire peripheral surface of the discharge hole, and the cap is locked to the head of the valve body by the elastic repulsive force of the elastic body, and the elastic body and the cap are interposed therebetween. Since the discharge hole is closed, the refrigerant discharged from the discharge hole when the pressure in the compressor is abnormally increased, the clearance formed by the deformation of the elastic body is formed on the contact surface between the elastic body and the head of the valve body. Can be discharged to the outside. In addition, foreign matters such as sand that are about to enter the discharge hole from the outside can be completely shut out by the cap and the elastic body. Therefore, a highly reliable safety valve that can maintain the function as a safety valve over a long period of time and can reliably prevent the valve from being normally closed due to the intrusion of foreign matter such as sand or the entry of foreign matter that has entered. Can be obtained. Also, the thickness of the elastic body may be about several millimeters and it is interposed in a compressed state, so the height dimension of the safety valve is not so large even with the elastic body interposed, and the cap can be easily attached even in a small arrangement space. Can be installed.

Furthermore, the safety valve of the compressor according to the present invention is the above-described safety valve of the compressor, wherein at least the cap of the cap and the elastic body has a hexagonal shape that is the same shape as the head of the valve body that is a hexagonal bolt shape. It is said that it is said.

  According to the present invention, since at least the cap of the cap and the elastic body has a hexagonal shape that is the same shape as the head of the valve body that is in the shape of a hexagonal bolt, It is not necessary to secure an extra space, and the cap and the elastic body having the same shape can be easily attached to correspond to the valve body. Therefore, the work of assembling the cap and the elastic body to the valve body can be facilitated. The elastic body may be hexagonal like the cap, but the elastic body is not necessarily hexagonal because it can be deformed.

  Furthermore, the safety valve for the compressor according to the present invention is characterized in that, in the safety valve for the compressor described above, the locking portions are provided on two opposite sides of a hexagonal cap.

  According to the present invention, since the locking portion is provided only on the two opposite sides of the hexagonal cap, the cap is held against the elastic body except in the vicinity of the two sides where the locking portion is provided. The force is slightly reduced and the elastic body is easily deformed. Therefore, when the refrigerant is discharged from the discharge hole, the refrigerant can be easily released to the outside, and the function of the safety valve can be sufficiently ensured even when the discharge hole is closed.

  Furthermore, the safety valve of the compressor of the present invention is the above-described safety valve of the compressor, wherein the cap has a holding piece that holds the elastic body on a plurality of sides except for the two sides where the locking portion is provided. Are integrally formed by bending.

  According to the present invention, since the holding pieces for holding the elastic body are integrally formed on a plurality of sides except for the two sides where the cap locking portions are provided, the elastic body is formed by the plurality of holding pieces. The elastic body can be prevented from falling off. Thereby, an elastic body can be reliably held between the cap and the head of the valve body, and entry of foreign matters such as sand into the discharge hole can be completely shut out.

  Furthermore, the safety valve of the compressor according to the present invention is characterized in that, in any of the safety valves of the compressor described above, the elastic body is mounted and fixed to the cap via an adhesive or an adhesive tape.

  According to the present invention, since the elastic body is attached and fixed to the cap via the adhesive or the adhesive tape, the cap and the elastic body can be easily integrated, and the cap and the head of the valve body The holding force of the elastic body interposed between the two can be increased. Thereby, it is possible to prevent the elastic body from being peeled off or displaced when the refrigerant is discharged from the discharge hole.

  Furthermore, the safety valve of the compressor of the present invention is the safety valve of any of the above-described compressors, wherein the elastic body is constituted by a foam based on ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM). It is characterized by being.

  According to the present invention, since the elastic body is composed of a foam based on ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM), the heat resistance of EPM and EPDM as an elastic body for a safety valve, Excellent characteristics such as weather resistance, cold resistance, oil resistance, and refrigerant resistance can be utilized. Moreover, moderate elasticity can be provided by setting it as a foam. Therefore, it is possible to obtain an optimal elastic body that has both a refrigerant discharge function and a foreign substance intrusion prevention function.

  According to the safety valve of the present invention, the refrigerant discharged from the discharge hole when the pressure in the compressor rises abnormally is passed through a gap formed by deformation of the elastic body on the contact surface between the elastic body and the head of the valve body. Can be released to the outside. In addition, it is possible to completely shut out foreign substances such as sand that are about to enter the discharge hole from the outside with the cap and elastic body, so that the function as a safety valve can be maintained over a long period of time, and foreign substances such as sand can enter. Therefore, it is possible to obtain a highly reliable safety valve that can surely prevent the valve from being normally opened due to the blocking of the valve due to the intrusion or the biting of the invading foreign matter. Also, the thickness of the elastic body may be about several millimeters and it is interposed in a compressed state, so the height dimension of the safety valve is not so large even with the elastic body interposed, and the cap can be easily attached even in a small arrangement space. Can be installed.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a longitudinal sectional view of a scroll compressor to which the safety valve of the compressor according to the first embodiment of the present invention is applied. FIG. 2 is an external view of the compressor safety valve. Is a top view thereof.
As shown in FIG. 1, a scroll compressor (compressor) 1 applied to an in-vehicle air conditioner includes an outer case 2 made of aluminum die casting. The outer case 2 has a cup shape with one end opened, and the bearing case 3 is fastened and fixed to the open end of the outer case 2 with bolts 4 so that a sealed space 5 is formed inside. It is supposed to be formed.

  A scroll compression mechanism 6 is incorporated in the sealed space 5. As is well known, the scroll compression mechanism 6 forms a pair of compression chambers 9 between the scroll members 7 and 8 by meshing the pair of fixed scroll members 7 and the orbiting scroll member 8 with a phase difference of 180 degrees. The compression chamber 9 is moved from the outer peripheral position to the center side, and the volume is gradually reduced to compress the refrigerant. The fixed scroll member 7 has a discharge port 10 for discharging compressed gas at the center, and is fixedly installed on the bottom wall surface of the outer case 2 via bolts 11. Further, the orbiting scroll member 8 is installed so as to be revolved and driven with a predetermined orbiting radius with respect to the fixed scroll member 7 by a drive mechanism described later.

  An O-ring 12 is provided on the outer periphery of the end plate of the fixed scroll member 7, and the O-ring 12 is in close contact with the inner peripheral surface of the outer case 2. As a result, the sealed space 5 is partitioned into the discharge chamber 13 and the suction chamber 14 via the O-ring 12. A discharge port 10 is opened in the discharge chamber 13 so that the high-temperature and high-pressure gas from the compression chamber 9 is discharged, and the compressed gas is sent to the refrigeration cycle side through the discharge chamber 13. It is said that. In addition, a suction port 15 provided in the outer case 2 is opened in the suction chamber 14, and the low-pressure refrigerant gas circulated through the refrigeration cycle is sucked into the compression chamber 9 through the suction chamber 14. It comes to be sucked.

  A crankshaft 16 is rotatably supported in the bearing case 3 via bearings 17 and 18 and a lip seal 19. An eccentric pin 20 is provided at one end of the crankshaft 16, and the orbiting scroll member 8 is connected to the eccentric pin 20 via a drive bush 21 so that the orbiting scroll member 8 is orbitally driven. ing. A rotation prevention mechanism 22 is provided between the thrust receiving surface of the bearing case 3 and the back surface of the end plate of the orbiting scroll member 8 to prevent the orbiting scroll member 8 from rotating. Accordingly, the orbiting scroll member 8 is configured to be revolved and driven with respect to the fixed scroll member 7.

  The other end side of the crankshaft 16 protrudes outward from the bearing case 3, and an electromagnetic clutch 23 is provided at the shaft end. The electromagnetic clutch 23 intermittently transmits power transmitted from a vehicle engine (not shown) via a belt between a pulley 25 and a crankshaft 16 rotatably supported on the outer periphery of the bearing case 3 via a bearing 24. By doing so, the scroll compressor 1 is driven ON / OFF.

  When the electromagnetic compressor 23 is energized, the scroll compressor 1 receives power from the pulley 25 via the electromagnetic clutch 23 and is coupled to the crankshaft 16 via the eccentric pin 20 and the drive bush 21. The orbiting scroll member 8 is driven to revolve around the fixed scroll member 7. As a result, the refrigerant gas sucked into the suction chamber 14 from the refrigeration cycle through the suction port 15 is sucked into the compression chamber 9. This refrigerant is compressed by a decrease in volume accompanying the swiveling movement toward the center side of the compression chamber 9, and is discharged into the discharge chamber 13 through the discharge port 10 provided in the center portion of the fixed scroll member 7, and is further refrigerated. Dispatched to cycle.

  The scroll compressor 1 is provided with a safety valve 30 that is operated under severe conditions and for releasing the abnormal pressure to the outside when the internal pressure is abnormally increased. The safety valve 30 is provided so as to pass through the outer case 2 and communicate with the discharge chamber 13 constituting the discharge path, and as shown in FIGS. 2 and 3, the valve body 31 having a hexagonal bolt shape is provided. I have. A discharge hole 32 penetrating in the axial direction is provided at the center of the valve body 31, and a valve body for opening and closing the discharge hole 32 and a spring for urging the valve body in the closing direction are incorporated therein. It is made up of. The safety valve 30 is provided with a threaded portion 33 so as to be attached to a screw hole on the outer case 2 side.

  A cap 35 is detachably attached to the head 34 of the valve body 31 having a hexagonal shape of the safety valve 30, and an elastic body 36 is interposed between the cap 35 and the head 34. As shown in FIG. 4, the cap 35 is formed by integrally bending a lid portion 35 </ b> A having the same hexagonal shape as the head portion 34 and two opposite sides of the lid portion 35 </ b> A. An elastic body formed by bending integrally with the other three sides excluding the two sides provided with the locking portion 35B, and a locking portion 35B having a U-shaped bent tip that is detachably locked with respect to A holding piece 35C for holding 36, and a positioning projection 35D of the elastic body 36 provided in a convex shape on the inner surface side at the center of the lid portion 35A. In addition, the remaining one side of the hexagonal shape is a coupling portion when the plurality of caps 35 are simultaneously press-molded, and is a portion that is cut off after the molding is completed, and is a vacant side.

  As shown in FIG. 5, the elastic body 36 has a hexagonal shape so as to be accommodated in the holding pieces 35 </ b> C on the three sides of the cap 35, and a punching hole 36 </ b> A for positioning is provided in the center portion. It is attached to the inner surface side via an adhesive or a double-sided adhesive tape. The elastic body 36 is made of a foam based on ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM), and has a thickness dimension T of about several mm (for example, about 3 mm). And has sufficient flexibility and elasticity.

  The elastic body 36 is interposed in a compressed state between the lid portion 35 </ b> A of the cap 35 and the head portion 34 of the valve body 31 by attaching the cap 35 to the head portion 34 of the valve body 31, and opens to the head portion 34. The discharge hole 32 is interposed so as to be in close contact with the head 34 so as to cover the entire peripheral surface. Further, the cap 35 is configured such that the locking portion 35 </ b> B is locked to the head 34 of the valve body 31 by the elastic repulsive force of the elastic body 36. Thus, the discharge hole 32 is covered with the elastic body 36 via the elastic body 36 and the cap 35 and is in a closed state.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
When the scroll compressor (compressor) 1 is operated under severe conditions and the pressure in the discharge cavity 13 rises abnormally and exceeds the set pressure of the safety valve 30, the safety valve 30 is opened. As a result, a part of the high-pressure refrigerant is discharged to the outside through the discharge hole 31, and damage to the scroll compressor 1 due to abnormal pressure is prevented. When the pressure in the scroll compressor 1 decreases, the safety valve 30 is returned by the spring pressure and closed.

  Here, the discharge hole 32 of the safety valve 30 is covered with an elastic body 36 interposed between the lid portion 35A of the cap 35 and the head portion 34 of the valve body 31, and is closed. Since the elastic body 36 is elastically deformed by the pressure of the refrigerant discharged from the discharge hole 32 and a gap is formed between the elastic body 36 and the close contact surface with the head 34, the refrigerant can be discharged to the outside through the gap. . Accordingly, the abnormal pressure can be reduced and the scroll compressor 1 can be protected, and even if the discharge hole 32 is closed by the elastic body 36 and the cap 35, the function as the safety valve 30 can be reliably maintained.

  Further, since the discharge hole 32 of the safety valve 30 is closed by the elastic body 36 and the cap 35, foreign matter such as mud and sand that is about to enter the discharge hole 32 from the outside is completely shut by the cap 35 and the elastic body 36. Can be out. Therefore, the function of the safety valve 30 can be maintained for a long period of time, and the highly reliable safety valve 30 that can reliably prevent the valve from being closed due to the entry of foreign matter or the normally open state of the valve due to the entry of foreign matter that has entered is provided. Can be obtained. Further, the thickness of the elastic body 36 may be, for example, about 3 mm and several millimeters, and is interposed in a compressed state. Therefore, even if the elastic body 36 is interposed, the height direction dimension of the cap 35 is not so large. Therefore, the cap 35 can be easily attached even in a small arrangement space.

  In addition, since the cap 35 and the elastic body 36 have the same hexagonal shape as the head 34 of the valve body 31 each having a hexagonal bolt shape, the cap 35 and the elastic body 36 are arranged around the head 34 of the valve body 31 to which the cap 35 is attached. It is not necessary to secure an extra space, and the cap 35 and the elastic body 36 having the same shape can be easily mounted in correspondence with the valve body 31. Therefore, the work of assembling the cap 35 and the elastic body 36 to the valve main body 31 can be facilitated.

  In addition, a locking portion 35B for detachably attaching the cap 35 to the valve body 31 is provided only on two opposite sides of the hexagonal cap 35. For this reason, the pressing force of the elastic body 36 by the lid portion 35A is slightly reduced except near the two sides where the locking portions 35B are provided, and the elastic body 36 is easily deformed. Accordingly, when the refrigerant is discharged from the discharge hole 32, the refrigerant can be easily released to the outside, and the function of the safety valve 30 can be sufficiently ensured even when the discharge hole 32 is closed.

  Further, since the holding pieces 35C for holding the elastic body 36 are integrally bent on the three sides excluding the two sides where the locking portions 35B of the cap 35 are provided, the elastic body is formed by the plurality of holding pieces 35C. 36 is held, and the elastic body 36 can be prevented from falling off. Therefore, the elastic body 36 can be reliably held between the cap 35 and the head portion 34 of the valve main body 31, and the entry of foreign matters such as sand into the discharge hole 32 can be completely shut out.

  In the present embodiment, the elastic body 36 is attached and fixed to the inner surface of the cap 35 with an adhesive or a double-sided adhesive tape. Therefore, the cap 35 and the elastic body 36 can be easily integrated, and the holding force of the elastic body 36 interposed between the cap 35 and the head portion 34 of the valve body 31 can be increased. . Accordingly, it is possible to prevent the elastic body 36 from being peeled off or displaced when the refrigerant is discharged from the discharge hole 32.

  Furthermore, since the elastic body 36 is made of a foam based on ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM), the heat resistance of EPM and EPDM as the elastic body 36 for the safety valve 30; Excellent characteristics such as weather resistance, cold resistance, oil resistance, and refrigerant resistance can be utilized. Moreover, moderate elasticity can be provided by setting it as a foam. Therefore, the optimum elastic body 36 having both the refrigerant discharge function and the foreign substance intrusion prevention function can be obtained.

  In the present embodiment, the positioning projection 35D of the elastic body 36 is provided on the cap 35, and the punching hole 36A for positioning is provided on the elastic body 36. Therefore, the elastic body 36 can be accurately positioned and incorporated. It is possible to improve assembly. Since the holding pieces 35C are provided on the three sides of the hexagonal cap 35, the elastic body 36 can be incorporated at an appropriate position even if the projection 35D and the punching hole 36A are omitted. In the present embodiment, the elastic body 36 has a hexagonal shape like the cap 35. However, since the elastic body 36 can be freely deformed, it does not necessarily have to be a hexagonal shape.

[ Reference example ]
Next, a reference example of the present invention will be described with reference to FIGS.
This reference example differs from the first embodiment described above in that the elastic body 46 is C-shaped and a shielding portion 35E is provided on the cap 35 side correspondingly. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In this reference example , the elastic body 46 interposed between the head portion 34 of the valve body 31 and the lid portion 35A of the cap 35 has a C-shape with an opening portion 46A provided in part as shown in FIG. It is made into a shape.

The elastic body 46 covers the peripheral surface of the discharge hole 32 opened in the head portion 34 of the valve main body 31, and the head portion 34 and the cap 35 of the valve main body 31 with the opening portion 46 </ b> A oriented in a specific direction. It is set as the structure interposed in the compression state between 35 A of cover parts. A shielding portion 35E that shields the outlet of the opening 46A is integrally formed on one side of the hexagonal shape of the cap 35 so as to face the opening 46A of the elastic body 46. In this reference example , the positioning projection 35D of the cap 35 is omitted.

According to this reference example , when the pressure in the scroll compressor (compressor) 1 rises abnormally, the refrigerant discharged from the discharge hole 32 of the safety valve 30 is discharged to the outside through the opening 46A of the C-shaped elastic body 46. can do. Further, foreign matter such as mud and sand that is about to enter the discharge hole 32 from the outside can be shut out by the shielding portion 35E that covers the outlet of the opening portion 46A of the C-shaped elastic body 46 provided in the cap 35. .

Therefore, in this reference example , as in the first embodiment, the function as the safety valve 30 can be maintained for a long period of time, and the valve is blocked by the entry of foreign matter such as mud and sand, or the valve by the entry of the entered foreign matter. Thus, it is possible to obtain a highly reliable safety valve 30 that can reliably prevent the normally open state and the like. Further, the thickness of the elastic body 46 may be about several millimeters and is interposed in a compressed state. Therefore, even if the elastic body 46 is interposed, the height dimension of the safety valve 30 is not so large, and it is easy even in a small arrangement space. The cap 35 can be attached to.

Furthermore, since the elastic body 46 according to this reference example is a C-shaped elastic body 46, the direction of refrigerant discharge can be regulated by installing the opening 46A in a specific direction. Therefore, a white smoke prevention effect can also be expected.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above embodiment, the example in which the safety valve of the compressor is applied to the scroll compressor 1 has been described. However, the compressor to be applied may be any type of compressor. Further, the position where the safety valve is installed may be anywhere as long as it is a position communicating with the discharge system path (discharge chamber) in the compressor, but it does not affect the mountability of the compressor and the discharged refrigerant is Needless to say, a position that does not have an adverse effect is appropriately selected.

It is a longitudinal cross-sectional view of the scroll compressor which provided the safety valve of the compressor which concerns on 1st Embodiment of this invention. It is an external view of the safety valve of the compressor shown in FIG. It is a top view of the safety valve of the compressor shown in FIG. It is a top view (A) of the cap used for the safety valve of the compressor shown in FIG. 2, its aa cross-section equivalent figure (B), and a bb cross-section equivalent figure (C). It is the top view (A) of the elastic body used for the safety valve of the compressor shown in FIG. 2, and its side view (B). It is a top view of the safety valve of the compressor which concerns on the reference example of this invention. It is the top view (A) of the cap used for the safety valve of the compressor shown in FIG. 6, its cc cross-section equivalent figure (B), and dd cross-section equivalent figure (C). It is a top view of the elastic body used for the safety valve of the compressor shown in FIG.

1 Scroll compressor (compressor)
13 Discharge chamber 30 Safety valve 31 Valve body 32 Discharge hole 34 Head 35 Cap 35B Locking portion 35C Holding piece 35E Shielding portion 36 Elastic body

Claims (6)

In the safety valve of the compressor in which a discharge hole communicating with a discharge system passage in the compressor is opened at the head of the valve body, and when the pressure in the compressor rises abnormally, the abnormal pressure is released to the outside through the discharge hole.
A cap that is integrally bent and formed, and a cap that is detachably attached to the head of the valve body via the locking portion;
An elastic body interposed in a compressed state between the cap and the head of the valve body, and in close contact with the head of the valve body;
The elastic body is interposed so as to cover the entire circumferential surface of the discharge hole, and the cap is locked to the head of the valve body by the elastic repulsive force of the elastic body, and the elastic body and the cap are A safety valve for a compressor, characterized in that the discharge hole is closed. 2. The safety valve for a compressor according to claim 1 , wherein at least the cap of the cap and the elastic body has a hexagonal shape that is the same shape as a head of the valve body that is a hexagonal bolt shape. . The safety valve for a compressor according to claim 2 , wherein the engaging portion is provided on two sides of the hexagonal cap facing each other. The cap, the plurality of sides except two sides the locking portion is provided, the holding piece which holds the elastic body according to claim 3, characterized in that it is formed bent integrally Compressor safety valve. The compressor safety valve according to any one of claims 1 to 4 , wherein the elastic body is attached and fixed to the cap via an adhesive or an adhesive tape. The compressor according to any one of claims 1 to 5 , wherein the elastic body is made of a foam based on ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM). safety valve.

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